1 /* 2 * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com> 3 * 4 * Parts came from builtin-{top,stat,record}.c, see those files for further 5 * copyright notes. 6 * 7 * Released under the GPL v2. (and only v2, not any later version) 8 */ 9 10 #include <byteswap.h> 11 #include <linux/bitops.h> 12 #include <api/fs/debugfs.h> 13 #include <traceevent/event-parse.h> 14 #include <linux/hw_breakpoint.h> 15 #include <linux/perf_event.h> 16 #include <sys/resource.h> 17 #include "asm/bug.h" 18 #include "callchain.h" 19 #include "cgroup.h" 20 #include "evsel.h" 21 #include "evlist.h" 22 #include "util.h" 23 #include "cpumap.h" 24 #include "thread_map.h" 25 #include "target.h" 26 #include "perf_regs.h" 27 #include "debug.h" 28 #include "trace-event.h" 29 #include "stat.h" 30 31 static struct { 32 bool sample_id_all; 33 bool exclude_guest; 34 bool mmap2; 35 bool cloexec; 36 bool clockid; 37 bool clockid_wrong; 38 } perf_missing_features; 39 40 static clockid_t clockid; 41 42 static int perf_evsel__no_extra_init(struct perf_evsel *evsel __maybe_unused) 43 { 44 return 0; 45 } 46 47 static void perf_evsel__no_extra_fini(struct perf_evsel *evsel __maybe_unused) 48 { 49 } 50 51 static struct { 52 size_t size; 53 int (*init)(struct perf_evsel *evsel); 54 void (*fini)(struct perf_evsel *evsel); 55 } perf_evsel__object = { 56 .size = sizeof(struct perf_evsel), 57 .init = perf_evsel__no_extra_init, 58 .fini = perf_evsel__no_extra_fini, 59 }; 60 61 int perf_evsel__object_config(size_t object_size, 62 int (*init)(struct perf_evsel *evsel), 63 void (*fini)(struct perf_evsel *evsel)) 64 { 65 66 if (object_size == 0) 67 goto set_methods; 68 69 if (perf_evsel__object.size > object_size) 70 return -EINVAL; 71 72 perf_evsel__object.size = object_size; 73 74 set_methods: 75 if (init != NULL) 76 perf_evsel__object.init = init; 77 78 if (fini != NULL) 79 perf_evsel__object.fini = fini; 80 81 return 0; 82 } 83 84 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y)) 85 86 int __perf_evsel__sample_size(u64 sample_type) 87 { 88 u64 mask = sample_type & PERF_SAMPLE_MASK; 89 int size = 0; 90 int i; 91 92 for (i = 0; i < 64; i++) { 93 if (mask & (1ULL << i)) 94 size++; 95 } 96 97 size *= sizeof(u64); 98 99 return size; 100 } 101 102 /** 103 * __perf_evsel__calc_id_pos - calculate id_pos. 104 * @sample_type: sample type 105 * 106 * This function returns the position of the event id (PERF_SAMPLE_ID or 107 * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct 108 * sample_event. 109 */ 110 static int __perf_evsel__calc_id_pos(u64 sample_type) 111 { 112 int idx = 0; 113 114 if (sample_type & PERF_SAMPLE_IDENTIFIER) 115 return 0; 116 117 if (!(sample_type & PERF_SAMPLE_ID)) 118 return -1; 119 120 if (sample_type & PERF_SAMPLE_IP) 121 idx += 1; 122 123 if (sample_type & PERF_SAMPLE_TID) 124 idx += 1; 125 126 if (sample_type & PERF_SAMPLE_TIME) 127 idx += 1; 128 129 if (sample_type & PERF_SAMPLE_ADDR) 130 idx += 1; 131 132 return idx; 133 } 134 135 /** 136 * __perf_evsel__calc_is_pos - calculate is_pos. 137 * @sample_type: sample type 138 * 139 * This function returns the position (counting backwards) of the event id 140 * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if 141 * sample_id_all is used there is an id sample appended to non-sample events. 142 */ 143 static int __perf_evsel__calc_is_pos(u64 sample_type) 144 { 145 int idx = 1; 146 147 if (sample_type & PERF_SAMPLE_IDENTIFIER) 148 return 1; 149 150 if (!(sample_type & PERF_SAMPLE_ID)) 151 return -1; 152 153 if (sample_type & PERF_SAMPLE_CPU) 154 idx += 1; 155 156 if (sample_type & PERF_SAMPLE_STREAM_ID) 157 idx += 1; 158 159 return idx; 160 } 161 162 void perf_evsel__calc_id_pos(struct perf_evsel *evsel) 163 { 164 evsel->id_pos = __perf_evsel__calc_id_pos(evsel->attr.sample_type); 165 evsel->is_pos = __perf_evsel__calc_is_pos(evsel->attr.sample_type); 166 } 167 168 void __perf_evsel__set_sample_bit(struct perf_evsel *evsel, 169 enum perf_event_sample_format bit) 170 { 171 if (!(evsel->attr.sample_type & bit)) { 172 evsel->attr.sample_type |= bit; 173 evsel->sample_size += sizeof(u64); 174 perf_evsel__calc_id_pos(evsel); 175 } 176 } 177 178 void __perf_evsel__reset_sample_bit(struct perf_evsel *evsel, 179 enum perf_event_sample_format bit) 180 { 181 if (evsel->attr.sample_type & bit) { 182 evsel->attr.sample_type &= ~bit; 183 evsel->sample_size -= sizeof(u64); 184 perf_evsel__calc_id_pos(evsel); 185 } 186 } 187 188 void perf_evsel__set_sample_id(struct perf_evsel *evsel, 189 bool can_sample_identifier) 190 { 191 if (can_sample_identifier) { 192 perf_evsel__reset_sample_bit(evsel, ID); 193 perf_evsel__set_sample_bit(evsel, IDENTIFIER); 194 } else { 195 perf_evsel__set_sample_bit(evsel, ID); 196 } 197 evsel->attr.read_format |= PERF_FORMAT_ID; 198 } 199 200 void perf_evsel__init(struct perf_evsel *evsel, 201 struct perf_event_attr *attr, int idx) 202 { 203 evsel->idx = idx; 204 evsel->tracking = !idx; 205 evsel->attr = *attr; 206 evsel->leader = evsel; 207 evsel->unit = ""; 208 evsel->scale = 1.0; 209 INIT_LIST_HEAD(&evsel->node); 210 perf_evsel__object.init(evsel); 211 evsel->sample_size = __perf_evsel__sample_size(attr->sample_type); 212 perf_evsel__calc_id_pos(evsel); 213 } 214 215 struct perf_evsel *perf_evsel__new_idx(struct perf_event_attr *attr, int idx) 216 { 217 struct perf_evsel *evsel = zalloc(perf_evsel__object.size); 218 219 if (evsel != NULL) 220 perf_evsel__init(evsel, attr, idx); 221 222 return evsel; 223 } 224 225 struct perf_evsel *perf_evsel__newtp_idx(const char *sys, const char *name, int idx) 226 { 227 struct perf_evsel *evsel = zalloc(perf_evsel__object.size); 228 229 if (evsel != NULL) { 230 struct perf_event_attr attr = { 231 .type = PERF_TYPE_TRACEPOINT, 232 .sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME | 233 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD), 234 }; 235 236 if (asprintf(&evsel->name, "%s:%s", sys, name) < 0) 237 goto out_free; 238 239 evsel->tp_format = trace_event__tp_format(sys, name); 240 if (evsel->tp_format == NULL) 241 goto out_free; 242 243 event_attr_init(&attr); 244 attr.config = evsel->tp_format->id; 245 attr.sample_period = 1; 246 perf_evsel__init(evsel, &attr, idx); 247 } 248 249 return evsel; 250 251 out_free: 252 zfree(&evsel->name); 253 free(evsel); 254 return NULL; 255 } 256 257 const char *perf_evsel__hw_names[PERF_COUNT_HW_MAX] = { 258 "cycles", 259 "instructions", 260 "cache-references", 261 "cache-misses", 262 "branches", 263 "branch-misses", 264 "bus-cycles", 265 "stalled-cycles-frontend", 266 "stalled-cycles-backend", 267 "ref-cycles", 268 }; 269 270 static const char *__perf_evsel__hw_name(u64 config) 271 { 272 if (config < PERF_COUNT_HW_MAX && perf_evsel__hw_names[config]) 273 return perf_evsel__hw_names[config]; 274 275 return "unknown-hardware"; 276 } 277 278 static int perf_evsel__add_modifiers(struct perf_evsel *evsel, char *bf, size_t size) 279 { 280 int colon = 0, r = 0; 281 struct perf_event_attr *attr = &evsel->attr; 282 bool exclude_guest_default = false; 283 284 #define MOD_PRINT(context, mod) do { \ 285 if (!attr->exclude_##context) { \ 286 if (!colon) colon = ++r; \ 287 r += scnprintf(bf + r, size - r, "%c", mod); \ 288 } } while(0) 289 290 if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) { 291 MOD_PRINT(kernel, 'k'); 292 MOD_PRINT(user, 'u'); 293 MOD_PRINT(hv, 'h'); 294 exclude_guest_default = true; 295 } 296 297 if (attr->precise_ip) { 298 if (!colon) 299 colon = ++r; 300 r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp"); 301 exclude_guest_default = true; 302 } 303 304 if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) { 305 MOD_PRINT(host, 'H'); 306 MOD_PRINT(guest, 'G'); 307 } 308 #undef MOD_PRINT 309 if (colon) 310 bf[colon - 1] = ':'; 311 return r; 312 } 313 314 static int perf_evsel__hw_name(struct perf_evsel *evsel, char *bf, size_t size) 315 { 316 int r = scnprintf(bf, size, "%s", __perf_evsel__hw_name(evsel->attr.config)); 317 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r); 318 } 319 320 const char *perf_evsel__sw_names[PERF_COUNT_SW_MAX] = { 321 "cpu-clock", 322 "task-clock", 323 "page-faults", 324 "context-switches", 325 "cpu-migrations", 326 "minor-faults", 327 "major-faults", 328 "alignment-faults", 329 "emulation-faults", 330 "dummy", 331 }; 332 333 static const char *__perf_evsel__sw_name(u64 config) 334 { 335 if (config < PERF_COUNT_SW_MAX && perf_evsel__sw_names[config]) 336 return perf_evsel__sw_names[config]; 337 return "unknown-software"; 338 } 339 340 static int perf_evsel__sw_name(struct perf_evsel *evsel, char *bf, size_t size) 341 { 342 int r = scnprintf(bf, size, "%s", __perf_evsel__sw_name(evsel->attr.config)); 343 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r); 344 } 345 346 static int __perf_evsel__bp_name(char *bf, size_t size, u64 addr, u64 type) 347 { 348 int r; 349 350 r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr); 351 352 if (type & HW_BREAKPOINT_R) 353 r += scnprintf(bf + r, size - r, "r"); 354 355 if (type & HW_BREAKPOINT_W) 356 r += scnprintf(bf + r, size - r, "w"); 357 358 if (type & HW_BREAKPOINT_X) 359 r += scnprintf(bf + r, size - r, "x"); 360 361 return r; 362 } 363 364 static int perf_evsel__bp_name(struct perf_evsel *evsel, char *bf, size_t size) 365 { 366 struct perf_event_attr *attr = &evsel->attr; 367 int r = __perf_evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type); 368 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r); 369 } 370 371 const char *perf_evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX] 372 [PERF_EVSEL__MAX_ALIASES] = { 373 { "L1-dcache", "l1-d", "l1d", "L1-data", }, 374 { "L1-icache", "l1-i", "l1i", "L1-instruction", }, 375 { "LLC", "L2", }, 376 { "dTLB", "d-tlb", "Data-TLB", }, 377 { "iTLB", "i-tlb", "Instruction-TLB", }, 378 { "branch", "branches", "bpu", "btb", "bpc", }, 379 { "node", }, 380 }; 381 382 const char *perf_evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX] 383 [PERF_EVSEL__MAX_ALIASES] = { 384 { "load", "loads", "read", }, 385 { "store", "stores", "write", }, 386 { "prefetch", "prefetches", "speculative-read", "speculative-load", }, 387 }; 388 389 const char *perf_evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX] 390 [PERF_EVSEL__MAX_ALIASES] = { 391 { "refs", "Reference", "ops", "access", }, 392 { "misses", "miss", }, 393 }; 394 395 #define C(x) PERF_COUNT_HW_CACHE_##x 396 #define CACHE_READ (1 << C(OP_READ)) 397 #define CACHE_WRITE (1 << C(OP_WRITE)) 398 #define CACHE_PREFETCH (1 << C(OP_PREFETCH)) 399 #define COP(x) (1 << x) 400 401 /* 402 * cache operartion stat 403 * L1I : Read and prefetch only 404 * ITLB and BPU : Read-only 405 */ 406 static unsigned long perf_evsel__hw_cache_stat[C(MAX)] = { 407 [C(L1D)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 408 [C(L1I)] = (CACHE_READ | CACHE_PREFETCH), 409 [C(LL)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 410 [C(DTLB)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 411 [C(ITLB)] = (CACHE_READ), 412 [C(BPU)] = (CACHE_READ), 413 [C(NODE)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH), 414 }; 415 416 bool perf_evsel__is_cache_op_valid(u8 type, u8 op) 417 { 418 if (perf_evsel__hw_cache_stat[type] & COP(op)) 419 return true; /* valid */ 420 else 421 return false; /* invalid */ 422 } 423 424 int __perf_evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result, 425 char *bf, size_t size) 426 { 427 if (result) { 428 return scnprintf(bf, size, "%s-%s-%s", perf_evsel__hw_cache[type][0], 429 perf_evsel__hw_cache_op[op][0], 430 perf_evsel__hw_cache_result[result][0]); 431 } 432 433 return scnprintf(bf, size, "%s-%s", perf_evsel__hw_cache[type][0], 434 perf_evsel__hw_cache_op[op][1]); 435 } 436 437 static int __perf_evsel__hw_cache_name(u64 config, char *bf, size_t size) 438 { 439 u8 op, result, type = (config >> 0) & 0xff; 440 const char *err = "unknown-ext-hardware-cache-type"; 441 442 if (type > PERF_COUNT_HW_CACHE_MAX) 443 goto out_err; 444 445 op = (config >> 8) & 0xff; 446 err = "unknown-ext-hardware-cache-op"; 447 if (op > PERF_COUNT_HW_CACHE_OP_MAX) 448 goto out_err; 449 450 result = (config >> 16) & 0xff; 451 err = "unknown-ext-hardware-cache-result"; 452 if (result > PERF_COUNT_HW_CACHE_RESULT_MAX) 453 goto out_err; 454 455 err = "invalid-cache"; 456 if (!perf_evsel__is_cache_op_valid(type, op)) 457 goto out_err; 458 459 return __perf_evsel__hw_cache_type_op_res_name(type, op, result, bf, size); 460 out_err: 461 return scnprintf(bf, size, "%s", err); 462 } 463 464 static int perf_evsel__hw_cache_name(struct perf_evsel *evsel, char *bf, size_t size) 465 { 466 int ret = __perf_evsel__hw_cache_name(evsel->attr.config, bf, size); 467 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret); 468 } 469 470 static int perf_evsel__raw_name(struct perf_evsel *evsel, char *bf, size_t size) 471 { 472 int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->attr.config); 473 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret); 474 } 475 476 const char *perf_evsel__name(struct perf_evsel *evsel) 477 { 478 char bf[128]; 479 480 if (evsel->name) 481 return evsel->name; 482 483 switch (evsel->attr.type) { 484 case PERF_TYPE_RAW: 485 perf_evsel__raw_name(evsel, bf, sizeof(bf)); 486 break; 487 488 case PERF_TYPE_HARDWARE: 489 perf_evsel__hw_name(evsel, bf, sizeof(bf)); 490 break; 491 492 case PERF_TYPE_HW_CACHE: 493 perf_evsel__hw_cache_name(evsel, bf, sizeof(bf)); 494 break; 495 496 case PERF_TYPE_SOFTWARE: 497 perf_evsel__sw_name(evsel, bf, sizeof(bf)); 498 break; 499 500 case PERF_TYPE_TRACEPOINT: 501 scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint"); 502 break; 503 504 case PERF_TYPE_BREAKPOINT: 505 perf_evsel__bp_name(evsel, bf, sizeof(bf)); 506 break; 507 508 default: 509 scnprintf(bf, sizeof(bf), "unknown attr type: %d", 510 evsel->attr.type); 511 break; 512 } 513 514 evsel->name = strdup(bf); 515 516 return evsel->name ?: "unknown"; 517 } 518 519 const char *perf_evsel__group_name(struct perf_evsel *evsel) 520 { 521 return evsel->group_name ?: "anon group"; 522 } 523 524 int perf_evsel__group_desc(struct perf_evsel *evsel, char *buf, size_t size) 525 { 526 int ret; 527 struct perf_evsel *pos; 528 const char *group_name = perf_evsel__group_name(evsel); 529 530 ret = scnprintf(buf, size, "%s", group_name); 531 532 ret += scnprintf(buf + ret, size - ret, " { %s", 533 perf_evsel__name(evsel)); 534 535 for_each_group_member(pos, evsel) 536 ret += scnprintf(buf + ret, size - ret, ", %s", 537 perf_evsel__name(pos)); 538 539 ret += scnprintf(buf + ret, size - ret, " }"); 540 541 return ret; 542 } 543 544 static void 545 perf_evsel__config_callgraph(struct perf_evsel *evsel, 546 struct record_opts *opts) 547 { 548 bool function = perf_evsel__is_function_event(evsel); 549 struct perf_event_attr *attr = &evsel->attr; 550 551 perf_evsel__set_sample_bit(evsel, CALLCHAIN); 552 553 if (callchain_param.record_mode == CALLCHAIN_LBR) { 554 if (!opts->branch_stack) { 555 if (attr->exclude_user) { 556 pr_warning("LBR callstack option is only available " 557 "to get user callchain information. " 558 "Falling back to framepointers.\n"); 559 } else { 560 perf_evsel__set_sample_bit(evsel, BRANCH_STACK); 561 attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER | 562 PERF_SAMPLE_BRANCH_CALL_STACK; 563 } 564 } else 565 pr_warning("Cannot use LBR callstack with branch stack. " 566 "Falling back to framepointers.\n"); 567 } 568 569 if (callchain_param.record_mode == CALLCHAIN_DWARF) { 570 if (!function) { 571 perf_evsel__set_sample_bit(evsel, REGS_USER); 572 perf_evsel__set_sample_bit(evsel, STACK_USER); 573 attr->sample_regs_user = PERF_REGS_MASK; 574 attr->sample_stack_user = callchain_param.dump_size; 575 attr->exclude_callchain_user = 1; 576 } else { 577 pr_info("Cannot use DWARF unwind for function trace event," 578 " falling back to framepointers.\n"); 579 } 580 } 581 582 if (function) { 583 pr_info("Disabling user space callchains for function trace event.\n"); 584 attr->exclude_callchain_user = 1; 585 } 586 } 587 588 /* 589 * The enable_on_exec/disabled value strategy: 590 * 591 * 1) For any type of traced program: 592 * - all independent events and group leaders are disabled 593 * - all group members are enabled 594 * 595 * Group members are ruled by group leaders. They need to 596 * be enabled, because the group scheduling relies on that. 597 * 598 * 2) For traced programs executed by perf: 599 * - all independent events and group leaders have 600 * enable_on_exec set 601 * - we don't specifically enable or disable any event during 602 * the record command 603 * 604 * Independent events and group leaders are initially disabled 605 * and get enabled by exec. Group members are ruled by group 606 * leaders as stated in 1). 607 * 608 * 3) For traced programs attached by perf (pid/tid): 609 * - we specifically enable or disable all events during 610 * the record command 611 * 612 * When attaching events to already running traced we 613 * enable/disable events specifically, as there's no 614 * initial traced exec call. 615 */ 616 void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts) 617 { 618 struct perf_evsel *leader = evsel->leader; 619 struct perf_event_attr *attr = &evsel->attr; 620 int track = evsel->tracking; 621 bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread; 622 623 attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1; 624 attr->inherit = !opts->no_inherit; 625 626 perf_evsel__set_sample_bit(evsel, IP); 627 perf_evsel__set_sample_bit(evsel, TID); 628 629 if (evsel->sample_read) { 630 perf_evsel__set_sample_bit(evsel, READ); 631 632 /* 633 * We need ID even in case of single event, because 634 * PERF_SAMPLE_READ process ID specific data. 635 */ 636 perf_evsel__set_sample_id(evsel, false); 637 638 /* 639 * Apply group format only if we belong to group 640 * with more than one members. 641 */ 642 if (leader->nr_members > 1) { 643 attr->read_format |= PERF_FORMAT_GROUP; 644 attr->inherit = 0; 645 } 646 } 647 648 /* 649 * We default some events to have a default interval. But keep 650 * it a weak assumption overridable by the user. 651 */ 652 if (!attr->sample_period || (opts->user_freq != UINT_MAX || 653 opts->user_interval != ULLONG_MAX)) { 654 if (opts->freq) { 655 perf_evsel__set_sample_bit(evsel, PERIOD); 656 attr->freq = 1; 657 attr->sample_freq = opts->freq; 658 } else { 659 attr->sample_period = opts->default_interval; 660 } 661 } 662 663 /* 664 * Disable sampling for all group members other 665 * than leader in case leader 'leads' the sampling. 666 */ 667 if ((leader != evsel) && leader->sample_read) { 668 attr->sample_freq = 0; 669 attr->sample_period = 0; 670 } 671 672 if (opts->no_samples) 673 attr->sample_freq = 0; 674 675 if (opts->inherit_stat) 676 attr->inherit_stat = 1; 677 678 if (opts->sample_address) { 679 perf_evsel__set_sample_bit(evsel, ADDR); 680 attr->mmap_data = track; 681 } 682 683 /* 684 * We don't allow user space callchains for function trace 685 * event, due to issues with page faults while tracing page 686 * fault handler and its overall trickiness nature. 687 */ 688 if (perf_evsel__is_function_event(evsel)) 689 evsel->attr.exclude_callchain_user = 1; 690 691 if (callchain_param.enabled && !evsel->no_aux_samples) 692 perf_evsel__config_callgraph(evsel, opts); 693 694 if (opts->sample_intr_regs) { 695 attr->sample_regs_intr = PERF_REGS_MASK; 696 perf_evsel__set_sample_bit(evsel, REGS_INTR); 697 } 698 699 if (target__has_cpu(&opts->target)) 700 perf_evsel__set_sample_bit(evsel, CPU); 701 702 if (opts->period) 703 perf_evsel__set_sample_bit(evsel, PERIOD); 704 705 /* 706 * When the user explicitely disabled time don't force it here. 707 */ 708 if (opts->sample_time && 709 (!perf_missing_features.sample_id_all && 710 (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu))) 711 perf_evsel__set_sample_bit(evsel, TIME); 712 713 if (opts->raw_samples && !evsel->no_aux_samples) { 714 perf_evsel__set_sample_bit(evsel, TIME); 715 perf_evsel__set_sample_bit(evsel, RAW); 716 perf_evsel__set_sample_bit(evsel, CPU); 717 } 718 719 if (opts->sample_address) 720 perf_evsel__set_sample_bit(evsel, DATA_SRC); 721 722 if (opts->no_buffering) { 723 attr->watermark = 0; 724 attr->wakeup_events = 1; 725 } 726 if (opts->branch_stack && !evsel->no_aux_samples) { 727 perf_evsel__set_sample_bit(evsel, BRANCH_STACK); 728 attr->branch_sample_type = opts->branch_stack; 729 } 730 731 if (opts->sample_weight) 732 perf_evsel__set_sample_bit(evsel, WEIGHT); 733 734 attr->task = track; 735 attr->mmap = track; 736 attr->mmap2 = track && !perf_missing_features.mmap2; 737 attr->comm = track; 738 739 if (opts->sample_transaction) 740 perf_evsel__set_sample_bit(evsel, TRANSACTION); 741 742 if (opts->running_time) { 743 evsel->attr.read_format |= 744 PERF_FORMAT_TOTAL_TIME_ENABLED | 745 PERF_FORMAT_TOTAL_TIME_RUNNING; 746 } 747 748 /* 749 * XXX see the function comment above 750 * 751 * Disabling only independent events or group leaders, 752 * keeping group members enabled. 753 */ 754 if (perf_evsel__is_group_leader(evsel)) 755 attr->disabled = 1; 756 757 /* 758 * Setting enable_on_exec for independent events and 759 * group leaders for traced executed by perf. 760 */ 761 if (target__none(&opts->target) && perf_evsel__is_group_leader(evsel) && 762 !opts->initial_delay) 763 attr->enable_on_exec = 1; 764 765 if (evsel->immediate) { 766 attr->disabled = 0; 767 attr->enable_on_exec = 0; 768 } 769 770 clockid = opts->clockid; 771 if (opts->use_clockid) { 772 attr->use_clockid = 1; 773 attr->clockid = opts->clockid; 774 } 775 } 776 777 static int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads) 778 { 779 int cpu, thread; 780 781 if (evsel->system_wide) 782 nthreads = 1; 783 784 evsel->fd = xyarray__new(ncpus, nthreads, sizeof(int)); 785 786 if (evsel->fd) { 787 for (cpu = 0; cpu < ncpus; cpu++) { 788 for (thread = 0; thread < nthreads; thread++) { 789 FD(evsel, cpu, thread) = -1; 790 } 791 } 792 } 793 794 return evsel->fd != NULL ? 0 : -ENOMEM; 795 } 796 797 static int perf_evsel__run_ioctl(struct perf_evsel *evsel, int ncpus, int nthreads, 798 int ioc, void *arg) 799 { 800 int cpu, thread; 801 802 if (evsel->system_wide) 803 nthreads = 1; 804 805 for (cpu = 0; cpu < ncpus; cpu++) { 806 for (thread = 0; thread < nthreads; thread++) { 807 int fd = FD(evsel, cpu, thread), 808 err = ioctl(fd, ioc, arg); 809 810 if (err) 811 return err; 812 } 813 } 814 815 return 0; 816 } 817 818 int perf_evsel__set_filter(struct perf_evsel *evsel, int ncpus, int nthreads, 819 const char *filter) 820 { 821 return perf_evsel__run_ioctl(evsel, ncpus, nthreads, 822 PERF_EVENT_IOC_SET_FILTER, 823 (void *)filter); 824 } 825 826 int perf_evsel__enable(struct perf_evsel *evsel, int ncpus, int nthreads) 827 { 828 return perf_evsel__run_ioctl(evsel, ncpus, nthreads, 829 PERF_EVENT_IOC_ENABLE, 830 0); 831 } 832 833 int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads) 834 { 835 if (ncpus == 0 || nthreads == 0) 836 return 0; 837 838 if (evsel->system_wide) 839 nthreads = 1; 840 841 evsel->sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id)); 842 if (evsel->sample_id == NULL) 843 return -ENOMEM; 844 845 evsel->id = zalloc(ncpus * nthreads * sizeof(u64)); 846 if (evsel->id == NULL) { 847 xyarray__delete(evsel->sample_id); 848 evsel->sample_id = NULL; 849 return -ENOMEM; 850 } 851 852 return 0; 853 } 854 855 static void perf_evsel__free_fd(struct perf_evsel *evsel) 856 { 857 xyarray__delete(evsel->fd); 858 evsel->fd = NULL; 859 } 860 861 static void perf_evsel__free_id(struct perf_evsel *evsel) 862 { 863 xyarray__delete(evsel->sample_id); 864 evsel->sample_id = NULL; 865 zfree(&evsel->id); 866 } 867 868 void perf_evsel__close_fd(struct perf_evsel *evsel, int ncpus, int nthreads) 869 { 870 int cpu, thread; 871 872 if (evsel->system_wide) 873 nthreads = 1; 874 875 for (cpu = 0; cpu < ncpus; cpu++) 876 for (thread = 0; thread < nthreads; ++thread) { 877 close(FD(evsel, cpu, thread)); 878 FD(evsel, cpu, thread) = -1; 879 } 880 } 881 882 void perf_evsel__exit(struct perf_evsel *evsel) 883 { 884 assert(list_empty(&evsel->node)); 885 perf_evsel__free_fd(evsel); 886 perf_evsel__free_id(evsel); 887 close_cgroup(evsel->cgrp); 888 cpu_map__put(evsel->cpus); 889 thread_map__put(evsel->threads); 890 zfree(&evsel->group_name); 891 zfree(&evsel->name); 892 perf_evsel__object.fini(evsel); 893 } 894 895 void perf_evsel__delete(struct perf_evsel *evsel) 896 { 897 perf_evsel__exit(evsel); 898 free(evsel); 899 } 900 901 void perf_evsel__compute_deltas(struct perf_evsel *evsel, int cpu, int thread, 902 struct perf_counts_values *count) 903 { 904 struct perf_counts_values tmp; 905 906 if (!evsel->prev_raw_counts) 907 return; 908 909 if (cpu == -1) { 910 tmp = evsel->prev_raw_counts->aggr; 911 evsel->prev_raw_counts->aggr = *count; 912 } else { 913 tmp = *perf_counts(evsel->prev_raw_counts, cpu, thread); 914 *perf_counts(evsel->prev_raw_counts, cpu, thread) = *count; 915 } 916 917 count->val = count->val - tmp.val; 918 count->ena = count->ena - tmp.ena; 919 count->run = count->run - tmp.run; 920 } 921 922 void perf_counts_values__scale(struct perf_counts_values *count, 923 bool scale, s8 *pscaled) 924 { 925 s8 scaled = 0; 926 927 if (scale) { 928 if (count->run == 0) { 929 scaled = -1; 930 count->val = 0; 931 } else if (count->run < count->ena) { 932 scaled = 1; 933 count->val = (u64)((double) count->val * count->ena / count->run + 0.5); 934 } 935 } else 936 count->ena = count->run = 0; 937 938 if (pscaled) 939 *pscaled = scaled; 940 } 941 942 int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread, 943 struct perf_counts_values *count) 944 { 945 memset(count, 0, sizeof(*count)); 946 947 if (FD(evsel, cpu, thread) < 0) 948 return -EINVAL; 949 950 if (readn(FD(evsel, cpu, thread), count, sizeof(*count)) < 0) 951 return -errno; 952 953 return 0; 954 } 955 956 int __perf_evsel__read_on_cpu(struct perf_evsel *evsel, 957 int cpu, int thread, bool scale) 958 { 959 struct perf_counts_values count; 960 size_t nv = scale ? 3 : 1; 961 962 if (FD(evsel, cpu, thread) < 0) 963 return -EINVAL; 964 965 if (evsel->counts == NULL && perf_evsel__alloc_counts(evsel, cpu + 1, thread + 1) < 0) 966 return -ENOMEM; 967 968 if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) < 0) 969 return -errno; 970 971 perf_evsel__compute_deltas(evsel, cpu, thread, &count); 972 perf_counts_values__scale(&count, scale, NULL); 973 *perf_counts(evsel->counts, cpu, thread) = count; 974 return 0; 975 } 976 977 static int get_group_fd(struct perf_evsel *evsel, int cpu, int thread) 978 { 979 struct perf_evsel *leader = evsel->leader; 980 int fd; 981 982 if (perf_evsel__is_group_leader(evsel)) 983 return -1; 984 985 /* 986 * Leader must be already processed/open, 987 * if not it's a bug. 988 */ 989 BUG_ON(!leader->fd); 990 991 fd = FD(leader, cpu, thread); 992 BUG_ON(fd == -1); 993 994 return fd; 995 } 996 997 struct bit_names { 998 int bit; 999 const char *name; 1000 }; 1001 1002 static void __p_bits(char *buf, size_t size, u64 value, struct bit_names *bits) 1003 { 1004 bool first_bit = true; 1005 int i = 0; 1006 1007 do { 1008 if (value & bits[i].bit) { 1009 buf += scnprintf(buf, size, "%s%s", first_bit ? "" : "|", bits[i].name); 1010 first_bit = false; 1011 } 1012 } while (bits[++i].name != NULL); 1013 } 1014 1015 static void __p_sample_type(char *buf, size_t size, u64 value) 1016 { 1017 #define bit_name(n) { PERF_SAMPLE_##n, #n } 1018 struct bit_names bits[] = { 1019 bit_name(IP), bit_name(TID), bit_name(TIME), bit_name(ADDR), 1020 bit_name(READ), bit_name(CALLCHAIN), bit_name(ID), bit_name(CPU), 1021 bit_name(PERIOD), bit_name(STREAM_ID), bit_name(RAW), 1022 bit_name(BRANCH_STACK), bit_name(REGS_USER), bit_name(STACK_USER), 1023 bit_name(IDENTIFIER), bit_name(REGS_INTR), 1024 { .name = NULL, } 1025 }; 1026 #undef bit_name 1027 __p_bits(buf, size, value, bits); 1028 } 1029 1030 static void __p_read_format(char *buf, size_t size, u64 value) 1031 { 1032 #define bit_name(n) { PERF_FORMAT_##n, #n } 1033 struct bit_names bits[] = { 1034 bit_name(TOTAL_TIME_ENABLED), bit_name(TOTAL_TIME_RUNNING), 1035 bit_name(ID), bit_name(GROUP), 1036 { .name = NULL, } 1037 }; 1038 #undef bit_name 1039 __p_bits(buf, size, value, bits); 1040 } 1041 1042 #define BUF_SIZE 1024 1043 1044 #define p_hex(val) snprintf(buf, BUF_SIZE, "%#"PRIx64, (uint64_t)(val)) 1045 #define p_unsigned(val) snprintf(buf, BUF_SIZE, "%"PRIu64, (uint64_t)(val)) 1046 #define p_signed(val) snprintf(buf, BUF_SIZE, "%"PRId64, (int64_t)(val)) 1047 #define p_sample_type(val) __p_sample_type(buf, BUF_SIZE, val) 1048 #define p_read_format(val) __p_read_format(buf, BUF_SIZE, val) 1049 1050 #define PRINT_ATTRn(_n, _f, _p) \ 1051 do { \ 1052 if (attr->_f) { \ 1053 _p(attr->_f); \ 1054 ret += attr__fprintf(fp, _n, buf, priv);\ 1055 } \ 1056 } while (0) 1057 1058 #define PRINT_ATTRf(_f, _p) PRINT_ATTRn(#_f, _f, _p) 1059 1060 int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr, 1061 attr__fprintf_f attr__fprintf, void *priv) 1062 { 1063 char buf[BUF_SIZE]; 1064 int ret = 0; 1065 1066 PRINT_ATTRf(type, p_unsigned); 1067 PRINT_ATTRf(size, p_unsigned); 1068 PRINT_ATTRf(config, p_hex); 1069 PRINT_ATTRn("{ sample_period, sample_freq }", sample_period, p_unsigned); 1070 PRINT_ATTRf(sample_type, p_sample_type); 1071 PRINT_ATTRf(read_format, p_read_format); 1072 1073 PRINT_ATTRf(disabled, p_unsigned); 1074 PRINT_ATTRf(inherit, p_unsigned); 1075 PRINT_ATTRf(pinned, p_unsigned); 1076 PRINT_ATTRf(exclusive, p_unsigned); 1077 PRINT_ATTRf(exclude_user, p_unsigned); 1078 PRINT_ATTRf(exclude_kernel, p_unsigned); 1079 PRINT_ATTRf(exclude_hv, p_unsigned); 1080 PRINT_ATTRf(exclude_idle, p_unsigned); 1081 PRINT_ATTRf(mmap, p_unsigned); 1082 PRINT_ATTRf(comm, p_unsigned); 1083 PRINT_ATTRf(freq, p_unsigned); 1084 PRINT_ATTRf(inherit_stat, p_unsigned); 1085 PRINT_ATTRf(enable_on_exec, p_unsigned); 1086 PRINT_ATTRf(task, p_unsigned); 1087 PRINT_ATTRf(watermark, p_unsigned); 1088 PRINT_ATTRf(precise_ip, p_unsigned); 1089 PRINT_ATTRf(mmap_data, p_unsigned); 1090 PRINT_ATTRf(sample_id_all, p_unsigned); 1091 PRINT_ATTRf(exclude_host, p_unsigned); 1092 PRINT_ATTRf(exclude_guest, p_unsigned); 1093 PRINT_ATTRf(exclude_callchain_kernel, p_unsigned); 1094 PRINT_ATTRf(exclude_callchain_user, p_unsigned); 1095 PRINT_ATTRf(mmap2, p_unsigned); 1096 PRINT_ATTRf(comm_exec, p_unsigned); 1097 PRINT_ATTRf(use_clockid, p_unsigned); 1098 1099 PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned); 1100 PRINT_ATTRf(bp_type, p_unsigned); 1101 PRINT_ATTRn("{ bp_addr, config1 }", bp_addr, p_hex); 1102 PRINT_ATTRn("{ bp_len, config2 }", bp_len, p_hex); 1103 PRINT_ATTRf(sample_regs_user, p_hex); 1104 PRINT_ATTRf(sample_stack_user, p_unsigned); 1105 PRINT_ATTRf(clockid, p_signed); 1106 PRINT_ATTRf(sample_regs_intr, p_hex); 1107 PRINT_ATTRf(aux_watermark, p_unsigned); 1108 1109 return ret; 1110 } 1111 1112 static int __open_attr__fprintf(FILE *fp, const char *name, const char *val, 1113 void *priv __attribute__((unused))) 1114 { 1115 return fprintf(fp, " %-32s %s\n", name, val); 1116 } 1117 1118 static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus, 1119 struct thread_map *threads) 1120 { 1121 int cpu, thread, nthreads; 1122 unsigned long flags = PERF_FLAG_FD_CLOEXEC; 1123 int pid = -1, err; 1124 enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE; 1125 1126 if (evsel->system_wide) 1127 nthreads = 1; 1128 else 1129 nthreads = threads->nr; 1130 1131 if (evsel->fd == NULL && 1132 perf_evsel__alloc_fd(evsel, cpus->nr, nthreads) < 0) 1133 return -ENOMEM; 1134 1135 if (evsel->cgrp) { 1136 flags |= PERF_FLAG_PID_CGROUP; 1137 pid = evsel->cgrp->fd; 1138 } 1139 1140 fallback_missing_features: 1141 if (perf_missing_features.clockid_wrong) 1142 evsel->attr.clockid = CLOCK_MONOTONIC; /* should always work */ 1143 if (perf_missing_features.clockid) { 1144 evsel->attr.use_clockid = 0; 1145 evsel->attr.clockid = 0; 1146 } 1147 if (perf_missing_features.cloexec) 1148 flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC; 1149 if (perf_missing_features.mmap2) 1150 evsel->attr.mmap2 = 0; 1151 if (perf_missing_features.exclude_guest) 1152 evsel->attr.exclude_guest = evsel->attr.exclude_host = 0; 1153 retry_sample_id: 1154 if (perf_missing_features.sample_id_all) 1155 evsel->attr.sample_id_all = 0; 1156 1157 if (verbose >= 2) { 1158 fprintf(stderr, "%.60s\n", graph_dotted_line); 1159 fprintf(stderr, "perf_event_attr:\n"); 1160 perf_event_attr__fprintf(stderr, &evsel->attr, __open_attr__fprintf, NULL); 1161 fprintf(stderr, "%.60s\n", graph_dotted_line); 1162 } 1163 1164 for (cpu = 0; cpu < cpus->nr; cpu++) { 1165 1166 for (thread = 0; thread < nthreads; thread++) { 1167 int group_fd; 1168 1169 if (!evsel->cgrp && !evsel->system_wide) 1170 pid = thread_map__pid(threads, thread); 1171 1172 group_fd = get_group_fd(evsel, cpu, thread); 1173 retry_open: 1174 pr_debug2("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx\n", 1175 pid, cpus->map[cpu], group_fd, flags); 1176 1177 FD(evsel, cpu, thread) = sys_perf_event_open(&evsel->attr, 1178 pid, 1179 cpus->map[cpu], 1180 group_fd, flags); 1181 if (FD(evsel, cpu, thread) < 0) { 1182 err = -errno; 1183 pr_debug2("sys_perf_event_open failed, error %d\n", 1184 err); 1185 goto try_fallback; 1186 } 1187 set_rlimit = NO_CHANGE; 1188 1189 /* 1190 * If we succeeded but had to kill clockid, fail and 1191 * have perf_evsel__open_strerror() print us a nice 1192 * error. 1193 */ 1194 if (perf_missing_features.clockid || 1195 perf_missing_features.clockid_wrong) { 1196 err = -EINVAL; 1197 goto out_close; 1198 } 1199 } 1200 } 1201 1202 return 0; 1203 1204 try_fallback: 1205 /* 1206 * perf stat needs between 5 and 22 fds per CPU. When we run out 1207 * of them try to increase the limits. 1208 */ 1209 if (err == -EMFILE && set_rlimit < INCREASED_MAX) { 1210 struct rlimit l; 1211 int old_errno = errno; 1212 1213 if (getrlimit(RLIMIT_NOFILE, &l) == 0) { 1214 if (set_rlimit == NO_CHANGE) 1215 l.rlim_cur = l.rlim_max; 1216 else { 1217 l.rlim_cur = l.rlim_max + 1000; 1218 l.rlim_max = l.rlim_cur; 1219 } 1220 if (setrlimit(RLIMIT_NOFILE, &l) == 0) { 1221 set_rlimit++; 1222 errno = old_errno; 1223 goto retry_open; 1224 } 1225 } 1226 errno = old_errno; 1227 } 1228 1229 if (err != -EINVAL || cpu > 0 || thread > 0) 1230 goto out_close; 1231 1232 /* 1233 * Must probe features in the order they were added to the 1234 * perf_event_attr interface. 1235 */ 1236 if (!perf_missing_features.clockid_wrong && evsel->attr.use_clockid) { 1237 perf_missing_features.clockid_wrong = true; 1238 goto fallback_missing_features; 1239 } else if (!perf_missing_features.clockid && evsel->attr.use_clockid) { 1240 perf_missing_features.clockid = true; 1241 goto fallback_missing_features; 1242 } else if (!perf_missing_features.cloexec && (flags & PERF_FLAG_FD_CLOEXEC)) { 1243 perf_missing_features.cloexec = true; 1244 goto fallback_missing_features; 1245 } else if (!perf_missing_features.mmap2 && evsel->attr.mmap2) { 1246 perf_missing_features.mmap2 = true; 1247 goto fallback_missing_features; 1248 } else if (!perf_missing_features.exclude_guest && 1249 (evsel->attr.exclude_guest || evsel->attr.exclude_host)) { 1250 perf_missing_features.exclude_guest = true; 1251 goto fallback_missing_features; 1252 } else if (!perf_missing_features.sample_id_all) { 1253 perf_missing_features.sample_id_all = true; 1254 goto retry_sample_id; 1255 } 1256 1257 out_close: 1258 do { 1259 while (--thread >= 0) { 1260 close(FD(evsel, cpu, thread)); 1261 FD(evsel, cpu, thread) = -1; 1262 } 1263 thread = nthreads; 1264 } while (--cpu >= 0); 1265 return err; 1266 } 1267 1268 void perf_evsel__close(struct perf_evsel *evsel, int ncpus, int nthreads) 1269 { 1270 if (evsel->fd == NULL) 1271 return; 1272 1273 perf_evsel__close_fd(evsel, ncpus, nthreads); 1274 perf_evsel__free_fd(evsel); 1275 } 1276 1277 static struct { 1278 struct cpu_map map; 1279 int cpus[1]; 1280 } empty_cpu_map = { 1281 .map.nr = 1, 1282 .cpus = { -1, }, 1283 }; 1284 1285 static struct { 1286 struct thread_map map; 1287 int threads[1]; 1288 } empty_thread_map = { 1289 .map.nr = 1, 1290 .threads = { -1, }, 1291 }; 1292 1293 int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus, 1294 struct thread_map *threads) 1295 { 1296 if (cpus == NULL) { 1297 /* Work around old compiler warnings about strict aliasing */ 1298 cpus = &empty_cpu_map.map; 1299 } 1300 1301 if (threads == NULL) 1302 threads = &empty_thread_map.map; 1303 1304 return __perf_evsel__open(evsel, cpus, threads); 1305 } 1306 1307 int perf_evsel__open_per_cpu(struct perf_evsel *evsel, 1308 struct cpu_map *cpus) 1309 { 1310 return __perf_evsel__open(evsel, cpus, &empty_thread_map.map); 1311 } 1312 1313 int perf_evsel__open_per_thread(struct perf_evsel *evsel, 1314 struct thread_map *threads) 1315 { 1316 return __perf_evsel__open(evsel, &empty_cpu_map.map, threads); 1317 } 1318 1319 static int perf_evsel__parse_id_sample(const struct perf_evsel *evsel, 1320 const union perf_event *event, 1321 struct perf_sample *sample) 1322 { 1323 u64 type = evsel->attr.sample_type; 1324 const u64 *array = event->sample.array; 1325 bool swapped = evsel->needs_swap; 1326 union u64_swap u; 1327 1328 array += ((event->header.size - 1329 sizeof(event->header)) / sizeof(u64)) - 1; 1330 1331 if (type & PERF_SAMPLE_IDENTIFIER) { 1332 sample->id = *array; 1333 array--; 1334 } 1335 1336 if (type & PERF_SAMPLE_CPU) { 1337 u.val64 = *array; 1338 if (swapped) { 1339 /* undo swap of u64, then swap on individual u32s */ 1340 u.val64 = bswap_64(u.val64); 1341 u.val32[0] = bswap_32(u.val32[0]); 1342 } 1343 1344 sample->cpu = u.val32[0]; 1345 array--; 1346 } 1347 1348 if (type & PERF_SAMPLE_STREAM_ID) { 1349 sample->stream_id = *array; 1350 array--; 1351 } 1352 1353 if (type & PERF_SAMPLE_ID) { 1354 sample->id = *array; 1355 array--; 1356 } 1357 1358 if (type & PERF_SAMPLE_TIME) { 1359 sample->time = *array; 1360 array--; 1361 } 1362 1363 if (type & PERF_SAMPLE_TID) { 1364 u.val64 = *array; 1365 if (swapped) { 1366 /* undo swap of u64, then swap on individual u32s */ 1367 u.val64 = bswap_64(u.val64); 1368 u.val32[0] = bswap_32(u.val32[0]); 1369 u.val32[1] = bswap_32(u.val32[1]); 1370 } 1371 1372 sample->pid = u.val32[0]; 1373 sample->tid = u.val32[1]; 1374 array--; 1375 } 1376 1377 return 0; 1378 } 1379 1380 static inline bool overflow(const void *endp, u16 max_size, const void *offset, 1381 u64 size) 1382 { 1383 return size > max_size || offset + size > endp; 1384 } 1385 1386 #define OVERFLOW_CHECK(offset, size, max_size) \ 1387 do { \ 1388 if (overflow(endp, (max_size), (offset), (size))) \ 1389 return -EFAULT; \ 1390 } while (0) 1391 1392 #define OVERFLOW_CHECK_u64(offset) \ 1393 OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64)) 1394 1395 int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event, 1396 struct perf_sample *data) 1397 { 1398 u64 type = evsel->attr.sample_type; 1399 bool swapped = evsel->needs_swap; 1400 const u64 *array; 1401 u16 max_size = event->header.size; 1402 const void *endp = (void *)event + max_size; 1403 u64 sz; 1404 1405 /* 1406 * used for cross-endian analysis. See git commit 65014ab3 1407 * for why this goofiness is needed. 1408 */ 1409 union u64_swap u; 1410 1411 memset(data, 0, sizeof(*data)); 1412 data->cpu = data->pid = data->tid = -1; 1413 data->stream_id = data->id = data->time = -1ULL; 1414 data->period = evsel->attr.sample_period; 1415 data->weight = 0; 1416 1417 if (event->header.type != PERF_RECORD_SAMPLE) { 1418 if (!evsel->attr.sample_id_all) 1419 return 0; 1420 return perf_evsel__parse_id_sample(evsel, event, data); 1421 } 1422 1423 array = event->sample.array; 1424 1425 /* 1426 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes 1427 * up to PERF_SAMPLE_PERIOD. After that overflow() must be used to 1428 * check the format does not go past the end of the event. 1429 */ 1430 if (evsel->sample_size + sizeof(event->header) > event->header.size) 1431 return -EFAULT; 1432 1433 data->id = -1ULL; 1434 if (type & PERF_SAMPLE_IDENTIFIER) { 1435 data->id = *array; 1436 array++; 1437 } 1438 1439 if (type & PERF_SAMPLE_IP) { 1440 data->ip = *array; 1441 array++; 1442 } 1443 1444 if (type & PERF_SAMPLE_TID) { 1445 u.val64 = *array; 1446 if (swapped) { 1447 /* undo swap of u64, then swap on individual u32s */ 1448 u.val64 = bswap_64(u.val64); 1449 u.val32[0] = bswap_32(u.val32[0]); 1450 u.val32[1] = bswap_32(u.val32[1]); 1451 } 1452 1453 data->pid = u.val32[0]; 1454 data->tid = u.val32[1]; 1455 array++; 1456 } 1457 1458 if (type & PERF_SAMPLE_TIME) { 1459 data->time = *array; 1460 array++; 1461 } 1462 1463 data->addr = 0; 1464 if (type & PERF_SAMPLE_ADDR) { 1465 data->addr = *array; 1466 array++; 1467 } 1468 1469 if (type & PERF_SAMPLE_ID) { 1470 data->id = *array; 1471 array++; 1472 } 1473 1474 if (type & PERF_SAMPLE_STREAM_ID) { 1475 data->stream_id = *array; 1476 array++; 1477 } 1478 1479 if (type & PERF_SAMPLE_CPU) { 1480 1481 u.val64 = *array; 1482 if (swapped) { 1483 /* undo swap of u64, then swap on individual u32s */ 1484 u.val64 = bswap_64(u.val64); 1485 u.val32[0] = bswap_32(u.val32[0]); 1486 } 1487 1488 data->cpu = u.val32[0]; 1489 array++; 1490 } 1491 1492 if (type & PERF_SAMPLE_PERIOD) { 1493 data->period = *array; 1494 array++; 1495 } 1496 1497 if (type & PERF_SAMPLE_READ) { 1498 u64 read_format = evsel->attr.read_format; 1499 1500 OVERFLOW_CHECK_u64(array); 1501 if (read_format & PERF_FORMAT_GROUP) 1502 data->read.group.nr = *array; 1503 else 1504 data->read.one.value = *array; 1505 1506 array++; 1507 1508 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) { 1509 OVERFLOW_CHECK_u64(array); 1510 data->read.time_enabled = *array; 1511 array++; 1512 } 1513 1514 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) { 1515 OVERFLOW_CHECK_u64(array); 1516 data->read.time_running = *array; 1517 array++; 1518 } 1519 1520 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */ 1521 if (read_format & PERF_FORMAT_GROUP) { 1522 const u64 max_group_nr = UINT64_MAX / 1523 sizeof(struct sample_read_value); 1524 1525 if (data->read.group.nr > max_group_nr) 1526 return -EFAULT; 1527 sz = data->read.group.nr * 1528 sizeof(struct sample_read_value); 1529 OVERFLOW_CHECK(array, sz, max_size); 1530 data->read.group.values = 1531 (struct sample_read_value *)array; 1532 array = (void *)array + sz; 1533 } else { 1534 OVERFLOW_CHECK_u64(array); 1535 data->read.one.id = *array; 1536 array++; 1537 } 1538 } 1539 1540 if (type & PERF_SAMPLE_CALLCHAIN) { 1541 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64); 1542 1543 OVERFLOW_CHECK_u64(array); 1544 data->callchain = (struct ip_callchain *)array++; 1545 if (data->callchain->nr > max_callchain_nr) 1546 return -EFAULT; 1547 sz = data->callchain->nr * sizeof(u64); 1548 OVERFLOW_CHECK(array, sz, max_size); 1549 array = (void *)array + sz; 1550 } 1551 1552 if (type & PERF_SAMPLE_RAW) { 1553 OVERFLOW_CHECK_u64(array); 1554 u.val64 = *array; 1555 if (WARN_ONCE(swapped, 1556 "Endianness of raw data not corrected!\n")) { 1557 /* undo swap of u64, then swap on individual u32s */ 1558 u.val64 = bswap_64(u.val64); 1559 u.val32[0] = bswap_32(u.val32[0]); 1560 u.val32[1] = bswap_32(u.val32[1]); 1561 } 1562 data->raw_size = u.val32[0]; 1563 array = (void *)array + sizeof(u32); 1564 1565 OVERFLOW_CHECK(array, data->raw_size, max_size); 1566 data->raw_data = (void *)array; 1567 array = (void *)array + data->raw_size; 1568 } 1569 1570 if (type & PERF_SAMPLE_BRANCH_STACK) { 1571 const u64 max_branch_nr = UINT64_MAX / 1572 sizeof(struct branch_entry); 1573 1574 OVERFLOW_CHECK_u64(array); 1575 data->branch_stack = (struct branch_stack *)array++; 1576 1577 if (data->branch_stack->nr > max_branch_nr) 1578 return -EFAULT; 1579 sz = data->branch_stack->nr * sizeof(struct branch_entry); 1580 OVERFLOW_CHECK(array, sz, max_size); 1581 array = (void *)array + sz; 1582 } 1583 1584 if (type & PERF_SAMPLE_REGS_USER) { 1585 OVERFLOW_CHECK_u64(array); 1586 data->user_regs.abi = *array; 1587 array++; 1588 1589 if (data->user_regs.abi) { 1590 u64 mask = evsel->attr.sample_regs_user; 1591 1592 sz = hweight_long(mask) * sizeof(u64); 1593 OVERFLOW_CHECK(array, sz, max_size); 1594 data->user_regs.mask = mask; 1595 data->user_regs.regs = (u64 *)array; 1596 array = (void *)array + sz; 1597 } 1598 } 1599 1600 if (type & PERF_SAMPLE_STACK_USER) { 1601 OVERFLOW_CHECK_u64(array); 1602 sz = *array++; 1603 1604 data->user_stack.offset = ((char *)(array - 1) 1605 - (char *) event); 1606 1607 if (!sz) { 1608 data->user_stack.size = 0; 1609 } else { 1610 OVERFLOW_CHECK(array, sz, max_size); 1611 data->user_stack.data = (char *)array; 1612 array = (void *)array + sz; 1613 OVERFLOW_CHECK_u64(array); 1614 data->user_stack.size = *array++; 1615 if (WARN_ONCE(data->user_stack.size > sz, 1616 "user stack dump failure\n")) 1617 return -EFAULT; 1618 } 1619 } 1620 1621 data->weight = 0; 1622 if (type & PERF_SAMPLE_WEIGHT) { 1623 OVERFLOW_CHECK_u64(array); 1624 data->weight = *array; 1625 array++; 1626 } 1627 1628 data->data_src = PERF_MEM_DATA_SRC_NONE; 1629 if (type & PERF_SAMPLE_DATA_SRC) { 1630 OVERFLOW_CHECK_u64(array); 1631 data->data_src = *array; 1632 array++; 1633 } 1634 1635 data->transaction = 0; 1636 if (type & PERF_SAMPLE_TRANSACTION) { 1637 OVERFLOW_CHECK_u64(array); 1638 data->transaction = *array; 1639 array++; 1640 } 1641 1642 data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE; 1643 if (type & PERF_SAMPLE_REGS_INTR) { 1644 OVERFLOW_CHECK_u64(array); 1645 data->intr_regs.abi = *array; 1646 array++; 1647 1648 if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) { 1649 u64 mask = evsel->attr.sample_regs_intr; 1650 1651 sz = hweight_long(mask) * sizeof(u64); 1652 OVERFLOW_CHECK(array, sz, max_size); 1653 data->intr_regs.mask = mask; 1654 data->intr_regs.regs = (u64 *)array; 1655 array = (void *)array + sz; 1656 } 1657 } 1658 1659 return 0; 1660 } 1661 1662 size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type, 1663 u64 read_format) 1664 { 1665 size_t sz, result = sizeof(struct sample_event); 1666 1667 if (type & PERF_SAMPLE_IDENTIFIER) 1668 result += sizeof(u64); 1669 1670 if (type & PERF_SAMPLE_IP) 1671 result += sizeof(u64); 1672 1673 if (type & PERF_SAMPLE_TID) 1674 result += sizeof(u64); 1675 1676 if (type & PERF_SAMPLE_TIME) 1677 result += sizeof(u64); 1678 1679 if (type & PERF_SAMPLE_ADDR) 1680 result += sizeof(u64); 1681 1682 if (type & PERF_SAMPLE_ID) 1683 result += sizeof(u64); 1684 1685 if (type & PERF_SAMPLE_STREAM_ID) 1686 result += sizeof(u64); 1687 1688 if (type & PERF_SAMPLE_CPU) 1689 result += sizeof(u64); 1690 1691 if (type & PERF_SAMPLE_PERIOD) 1692 result += sizeof(u64); 1693 1694 if (type & PERF_SAMPLE_READ) { 1695 result += sizeof(u64); 1696 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) 1697 result += sizeof(u64); 1698 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) 1699 result += sizeof(u64); 1700 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */ 1701 if (read_format & PERF_FORMAT_GROUP) { 1702 sz = sample->read.group.nr * 1703 sizeof(struct sample_read_value); 1704 result += sz; 1705 } else { 1706 result += sizeof(u64); 1707 } 1708 } 1709 1710 if (type & PERF_SAMPLE_CALLCHAIN) { 1711 sz = (sample->callchain->nr + 1) * sizeof(u64); 1712 result += sz; 1713 } 1714 1715 if (type & PERF_SAMPLE_RAW) { 1716 result += sizeof(u32); 1717 result += sample->raw_size; 1718 } 1719 1720 if (type & PERF_SAMPLE_BRANCH_STACK) { 1721 sz = sample->branch_stack->nr * sizeof(struct branch_entry); 1722 sz += sizeof(u64); 1723 result += sz; 1724 } 1725 1726 if (type & PERF_SAMPLE_REGS_USER) { 1727 if (sample->user_regs.abi) { 1728 result += sizeof(u64); 1729 sz = hweight_long(sample->user_regs.mask) * sizeof(u64); 1730 result += sz; 1731 } else { 1732 result += sizeof(u64); 1733 } 1734 } 1735 1736 if (type & PERF_SAMPLE_STACK_USER) { 1737 sz = sample->user_stack.size; 1738 result += sizeof(u64); 1739 if (sz) { 1740 result += sz; 1741 result += sizeof(u64); 1742 } 1743 } 1744 1745 if (type & PERF_SAMPLE_WEIGHT) 1746 result += sizeof(u64); 1747 1748 if (type & PERF_SAMPLE_DATA_SRC) 1749 result += sizeof(u64); 1750 1751 if (type & PERF_SAMPLE_TRANSACTION) 1752 result += sizeof(u64); 1753 1754 if (type & PERF_SAMPLE_REGS_INTR) { 1755 if (sample->intr_regs.abi) { 1756 result += sizeof(u64); 1757 sz = hweight_long(sample->intr_regs.mask) * sizeof(u64); 1758 result += sz; 1759 } else { 1760 result += sizeof(u64); 1761 } 1762 } 1763 1764 return result; 1765 } 1766 1767 int perf_event__synthesize_sample(union perf_event *event, u64 type, 1768 u64 read_format, 1769 const struct perf_sample *sample, 1770 bool swapped) 1771 { 1772 u64 *array; 1773 size_t sz; 1774 /* 1775 * used for cross-endian analysis. See git commit 65014ab3 1776 * for why this goofiness is needed. 1777 */ 1778 union u64_swap u; 1779 1780 array = event->sample.array; 1781 1782 if (type & PERF_SAMPLE_IDENTIFIER) { 1783 *array = sample->id; 1784 array++; 1785 } 1786 1787 if (type & PERF_SAMPLE_IP) { 1788 *array = sample->ip; 1789 array++; 1790 } 1791 1792 if (type & PERF_SAMPLE_TID) { 1793 u.val32[0] = sample->pid; 1794 u.val32[1] = sample->tid; 1795 if (swapped) { 1796 /* 1797 * Inverse of what is done in perf_evsel__parse_sample 1798 */ 1799 u.val32[0] = bswap_32(u.val32[0]); 1800 u.val32[1] = bswap_32(u.val32[1]); 1801 u.val64 = bswap_64(u.val64); 1802 } 1803 1804 *array = u.val64; 1805 array++; 1806 } 1807 1808 if (type & PERF_SAMPLE_TIME) { 1809 *array = sample->time; 1810 array++; 1811 } 1812 1813 if (type & PERF_SAMPLE_ADDR) { 1814 *array = sample->addr; 1815 array++; 1816 } 1817 1818 if (type & PERF_SAMPLE_ID) { 1819 *array = sample->id; 1820 array++; 1821 } 1822 1823 if (type & PERF_SAMPLE_STREAM_ID) { 1824 *array = sample->stream_id; 1825 array++; 1826 } 1827 1828 if (type & PERF_SAMPLE_CPU) { 1829 u.val32[0] = sample->cpu; 1830 if (swapped) { 1831 /* 1832 * Inverse of what is done in perf_evsel__parse_sample 1833 */ 1834 u.val32[0] = bswap_32(u.val32[0]); 1835 u.val64 = bswap_64(u.val64); 1836 } 1837 *array = u.val64; 1838 array++; 1839 } 1840 1841 if (type & PERF_SAMPLE_PERIOD) { 1842 *array = sample->period; 1843 array++; 1844 } 1845 1846 if (type & PERF_SAMPLE_READ) { 1847 if (read_format & PERF_FORMAT_GROUP) 1848 *array = sample->read.group.nr; 1849 else 1850 *array = sample->read.one.value; 1851 array++; 1852 1853 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) { 1854 *array = sample->read.time_enabled; 1855 array++; 1856 } 1857 1858 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) { 1859 *array = sample->read.time_running; 1860 array++; 1861 } 1862 1863 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */ 1864 if (read_format & PERF_FORMAT_GROUP) { 1865 sz = sample->read.group.nr * 1866 sizeof(struct sample_read_value); 1867 memcpy(array, sample->read.group.values, sz); 1868 array = (void *)array + sz; 1869 } else { 1870 *array = sample->read.one.id; 1871 array++; 1872 } 1873 } 1874 1875 if (type & PERF_SAMPLE_CALLCHAIN) { 1876 sz = (sample->callchain->nr + 1) * sizeof(u64); 1877 memcpy(array, sample->callchain, sz); 1878 array = (void *)array + sz; 1879 } 1880 1881 if (type & PERF_SAMPLE_RAW) { 1882 u.val32[0] = sample->raw_size; 1883 if (WARN_ONCE(swapped, 1884 "Endianness of raw data not corrected!\n")) { 1885 /* 1886 * Inverse of what is done in perf_evsel__parse_sample 1887 */ 1888 u.val32[0] = bswap_32(u.val32[0]); 1889 u.val32[1] = bswap_32(u.val32[1]); 1890 u.val64 = bswap_64(u.val64); 1891 } 1892 *array = u.val64; 1893 array = (void *)array + sizeof(u32); 1894 1895 memcpy(array, sample->raw_data, sample->raw_size); 1896 array = (void *)array + sample->raw_size; 1897 } 1898 1899 if (type & PERF_SAMPLE_BRANCH_STACK) { 1900 sz = sample->branch_stack->nr * sizeof(struct branch_entry); 1901 sz += sizeof(u64); 1902 memcpy(array, sample->branch_stack, sz); 1903 array = (void *)array + sz; 1904 } 1905 1906 if (type & PERF_SAMPLE_REGS_USER) { 1907 if (sample->user_regs.abi) { 1908 *array++ = sample->user_regs.abi; 1909 sz = hweight_long(sample->user_regs.mask) * sizeof(u64); 1910 memcpy(array, sample->user_regs.regs, sz); 1911 array = (void *)array + sz; 1912 } else { 1913 *array++ = 0; 1914 } 1915 } 1916 1917 if (type & PERF_SAMPLE_STACK_USER) { 1918 sz = sample->user_stack.size; 1919 *array++ = sz; 1920 if (sz) { 1921 memcpy(array, sample->user_stack.data, sz); 1922 array = (void *)array + sz; 1923 *array++ = sz; 1924 } 1925 } 1926 1927 if (type & PERF_SAMPLE_WEIGHT) { 1928 *array = sample->weight; 1929 array++; 1930 } 1931 1932 if (type & PERF_SAMPLE_DATA_SRC) { 1933 *array = sample->data_src; 1934 array++; 1935 } 1936 1937 if (type & PERF_SAMPLE_TRANSACTION) { 1938 *array = sample->transaction; 1939 array++; 1940 } 1941 1942 if (type & PERF_SAMPLE_REGS_INTR) { 1943 if (sample->intr_regs.abi) { 1944 *array++ = sample->intr_regs.abi; 1945 sz = hweight_long(sample->intr_regs.mask) * sizeof(u64); 1946 memcpy(array, sample->intr_regs.regs, sz); 1947 array = (void *)array + sz; 1948 } else { 1949 *array++ = 0; 1950 } 1951 } 1952 1953 return 0; 1954 } 1955 1956 struct format_field *perf_evsel__field(struct perf_evsel *evsel, const char *name) 1957 { 1958 return pevent_find_field(evsel->tp_format, name); 1959 } 1960 1961 void *perf_evsel__rawptr(struct perf_evsel *evsel, struct perf_sample *sample, 1962 const char *name) 1963 { 1964 struct format_field *field = perf_evsel__field(evsel, name); 1965 int offset; 1966 1967 if (!field) 1968 return NULL; 1969 1970 offset = field->offset; 1971 1972 if (field->flags & FIELD_IS_DYNAMIC) { 1973 offset = *(int *)(sample->raw_data + field->offset); 1974 offset &= 0xffff; 1975 } 1976 1977 return sample->raw_data + offset; 1978 } 1979 1980 u64 perf_evsel__intval(struct perf_evsel *evsel, struct perf_sample *sample, 1981 const char *name) 1982 { 1983 struct format_field *field = perf_evsel__field(evsel, name); 1984 void *ptr; 1985 u64 value; 1986 1987 if (!field) 1988 return 0; 1989 1990 ptr = sample->raw_data + field->offset; 1991 1992 switch (field->size) { 1993 case 1: 1994 return *(u8 *)ptr; 1995 case 2: 1996 value = *(u16 *)ptr; 1997 break; 1998 case 4: 1999 value = *(u32 *)ptr; 2000 break; 2001 case 8: 2002 memcpy(&value, ptr, sizeof(u64)); 2003 break; 2004 default: 2005 return 0; 2006 } 2007 2008 if (!evsel->needs_swap) 2009 return value; 2010 2011 switch (field->size) { 2012 case 2: 2013 return bswap_16(value); 2014 case 4: 2015 return bswap_32(value); 2016 case 8: 2017 return bswap_64(value); 2018 default: 2019 return 0; 2020 } 2021 2022 return 0; 2023 } 2024 2025 static int comma_fprintf(FILE *fp, bool *first, const char *fmt, ...) 2026 { 2027 va_list args; 2028 int ret = 0; 2029 2030 if (!*first) { 2031 ret += fprintf(fp, ","); 2032 } else { 2033 ret += fprintf(fp, ":"); 2034 *first = false; 2035 } 2036 2037 va_start(args, fmt); 2038 ret += vfprintf(fp, fmt, args); 2039 va_end(args); 2040 return ret; 2041 } 2042 2043 static int __print_attr__fprintf(FILE *fp, const char *name, const char *val, void *priv) 2044 { 2045 return comma_fprintf(fp, (bool *)priv, " %s: %s", name, val); 2046 } 2047 2048 int perf_evsel__fprintf(struct perf_evsel *evsel, 2049 struct perf_attr_details *details, FILE *fp) 2050 { 2051 bool first = true; 2052 int printed = 0; 2053 2054 if (details->event_group) { 2055 struct perf_evsel *pos; 2056 2057 if (!perf_evsel__is_group_leader(evsel)) 2058 return 0; 2059 2060 if (evsel->nr_members > 1) 2061 printed += fprintf(fp, "%s{", evsel->group_name ?: ""); 2062 2063 printed += fprintf(fp, "%s", perf_evsel__name(evsel)); 2064 for_each_group_member(pos, evsel) 2065 printed += fprintf(fp, ",%s", perf_evsel__name(pos)); 2066 2067 if (evsel->nr_members > 1) 2068 printed += fprintf(fp, "}"); 2069 goto out; 2070 } 2071 2072 printed += fprintf(fp, "%s", perf_evsel__name(evsel)); 2073 2074 if (details->verbose) { 2075 printed += perf_event_attr__fprintf(fp, &evsel->attr, 2076 __print_attr__fprintf, &first); 2077 } else if (details->freq) { 2078 printed += comma_fprintf(fp, &first, " sample_freq=%" PRIu64, 2079 (u64)evsel->attr.sample_freq); 2080 } 2081 out: 2082 fputc('\n', fp); 2083 return ++printed; 2084 } 2085 2086 bool perf_evsel__fallback(struct perf_evsel *evsel, int err, 2087 char *msg, size_t msgsize) 2088 { 2089 if ((err == ENOENT || err == ENXIO || err == ENODEV) && 2090 evsel->attr.type == PERF_TYPE_HARDWARE && 2091 evsel->attr.config == PERF_COUNT_HW_CPU_CYCLES) { 2092 /* 2093 * If it's cycles then fall back to hrtimer based 2094 * cpu-clock-tick sw counter, which is always available even if 2095 * no PMU support. 2096 * 2097 * PPC returns ENXIO until 2.6.37 (behavior changed with commit 2098 * b0a873e). 2099 */ 2100 scnprintf(msg, msgsize, "%s", 2101 "The cycles event is not supported, trying to fall back to cpu-clock-ticks"); 2102 2103 evsel->attr.type = PERF_TYPE_SOFTWARE; 2104 evsel->attr.config = PERF_COUNT_SW_CPU_CLOCK; 2105 2106 zfree(&evsel->name); 2107 return true; 2108 } 2109 2110 return false; 2111 } 2112 2113 int perf_evsel__open_strerror(struct perf_evsel *evsel, struct target *target, 2114 int err, char *msg, size_t size) 2115 { 2116 char sbuf[STRERR_BUFSIZE]; 2117 2118 switch (err) { 2119 case EPERM: 2120 case EACCES: 2121 return scnprintf(msg, size, 2122 "You may not have permission to collect %sstats.\n" 2123 "Consider tweaking /proc/sys/kernel/perf_event_paranoid:\n" 2124 " -1 - Not paranoid at all\n" 2125 " 0 - Disallow raw tracepoint access for unpriv\n" 2126 " 1 - Disallow cpu events for unpriv\n" 2127 " 2 - Disallow kernel profiling for unpriv", 2128 target->system_wide ? "system-wide " : ""); 2129 case ENOENT: 2130 return scnprintf(msg, size, "The %s event is not supported.", 2131 perf_evsel__name(evsel)); 2132 case EMFILE: 2133 return scnprintf(msg, size, "%s", 2134 "Too many events are opened.\n" 2135 "Probably the maximum number of open file descriptors has been reached.\n" 2136 "Hint: Try again after reducing the number of events.\n" 2137 "Hint: Try increasing the limit with 'ulimit -n <limit>'"); 2138 case ENODEV: 2139 if (target->cpu_list) 2140 return scnprintf(msg, size, "%s", 2141 "No such device - did you specify an out-of-range profile CPU?\n"); 2142 break; 2143 case EOPNOTSUPP: 2144 if (evsel->attr.precise_ip) 2145 return scnprintf(msg, size, "%s", 2146 "\'precise\' request may not be supported. Try removing 'p' modifier."); 2147 #if defined(__i386__) || defined(__x86_64__) 2148 if (evsel->attr.type == PERF_TYPE_HARDWARE) 2149 return scnprintf(msg, size, "%s", 2150 "No hardware sampling interrupt available.\n" 2151 "No APIC? If so then you can boot the kernel with the \"lapic\" boot parameter to force-enable it."); 2152 #endif 2153 break; 2154 case EBUSY: 2155 if (find_process("oprofiled")) 2156 return scnprintf(msg, size, 2157 "The PMU counters are busy/taken by another profiler.\n" 2158 "We found oprofile daemon running, please stop it and try again."); 2159 break; 2160 case EINVAL: 2161 if (perf_missing_features.clockid) 2162 return scnprintf(msg, size, "clockid feature not supported."); 2163 if (perf_missing_features.clockid_wrong) 2164 return scnprintf(msg, size, "wrong clockid (%d).", clockid); 2165 break; 2166 default: 2167 break; 2168 } 2169 2170 return scnprintf(msg, size, 2171 "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n" 2172 "/bin/dmesg may provide additional information.\n" 2173 "No CONFIG_PERF_EVENTS=y kernel support configured?\n", 2174 err, strerror_r(err, sbuf, sizeof(sbuf)), 2175 perf_evsel__name(evsel)); 2176 } 2177